Скачать или смотреть 440 happened in three phases due to three reasons || तीन कारण के चक्कर में थ्री फेस में हुआ 440

440 happened in three phases due to three reasons || तीन कारण के चक्कर में थ्री फेस में हुआ 440

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3 phase voltage equal to 440 volt not 660 volt why only used three phase system not 4 or 5 checking three phase power
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